statistics: add historgram bench for MergePartitionHist2GlobalHist (#46788)

[ti-chi-bot]

This is an automated cherry-pick of #46788

What problem does this PR solve?

Issue Number: close #46805

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@774c4e7). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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##             release-6.5     #47039   +/-   ##
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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hi-rustin, qw4990

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-18 06:26:04.989806388 +0000 UTC m=+498730.957394434: ☑️ agreed by qw4990.
• 2023-09-18 07:59:38.416749819 +0000 UTC m=+504344.384337870: ☑️ agreed by hi-rustin.